Journal ArticleDOI
Re-evaluation of the thiocyanate dosimeter for pulse radiolysis
George V. Buxton,Craig R. Stuart +1 more
TLDR
In this article, the super-Fricke dosimeter was used as a secondary standard for the thiocyanate dosimeter in O2-saturated water and the results were improved to 3.47 ± 0.06.Abstract:
The thiocyanate dosimeter (10–2 mol dm–3 SCN– in O2-saturated water) has been standardised against the super-Fricke dosimeter (10–2 mol dm–3 FeII in O2-saturated 0.4 mol dm–3 H2SO4) using the hexacyanoferrate(II) dosimeter [5 × 10–3 mol dm–3 Fe(CN)64– in O2-saturated water] as a secondary standard. On the basis that G(FeIII)= 1.67 × 10–6 mol J–1 and IµFeIII= 220.4 m2 mol–1 at 304 nm and 25 °C in the super-Fricke dosimeter, we obtain GIµ[Fe(CN)63–]=(3.47 ± 0.06)× 10–5 m2 J–1 at 420 nm and GIµ(SCN)2˙–=(2.59 ± 0.05)× 10–4 m2 J–1 at 475 nm. These values remain unchanged when the solutions are saturated with air instead of O2 and are doubled in N2O-saturated solution.read more
Citations
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Journal ArticleDOI
A Common Carbanion Intermediate in the Recombination and Proton‐Catalysed Disproportionation of the Carboxyl Radical Anion, CO2.−, in Aqueous Solution
TL;DR: The carboxyl radical anion, CO2*- was produced by the reactions of OH radicals with either CO or formic acid in aqueous solution and was found to be independent of pH in the range 3-8 at constant ionic strength.
Journal ArticleDOI
Radiolysis of Liquid Water at Temperatures up to 300 °C: A Monte Carlo Simulation Study
Marie-Anne Hervé du Penhoat,T. Goulet,Yvon Frongillo,Marie-Josée Fraser,Philippe Bernat,Jean-Paul Jay-Gerin +5 more
TL;DR: In this paper, Monte Carlo simulations were performed to calculate the temperature dependence of the primary yields (g-values) of the radical and molecular products of the radiolysis of pure, deaerated liquid water by low linear energy transfer (LET) radiation.
Journal ArticleDOI
Temperature dependence of the reaction between the hydroxyl radical and organic matter.
TL;DR: The temperature-dependent bimolecular rate constants for the reaction of the hydroxyl radical with organic matter (OM) (k(OM-HO(•))) have been measured using electron pulse radiolysis and thiocyanate competition kinetics to provide a deeper fundamental understanding of the reaction between OM and HO(•).
Journal ArticleDOI
Antioxidant activity and free radical scavenging reactions of gentisic acid: in-vitro and pulse radiolysis studies.
TL;DR: It is proposed that the antioxidant and radioprotective properties of GA are exerted by its phenoxyl group, which supports the observed antioxidant capacity of GA.
Journal ArticleDOI
The oxidizing power of the glutathione thiyl radical as measured by its electrode potential at physiological pH
Edyta Madej,Peter Wardman +1 more
TL;DR: An apparently almost invariant potential between pH approximately 3 and 6, with potentials significantly lower than expected, is ascribed at least in part to errors arising from radical decay during the approach to the redox equilibrium and slow electron transfer of thiol compared to thiolate.
References
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Journal ArticleDOI
Critical Review of rate constants for reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals (⋅OH/⋅O− in Aqueous Solution
TL;DR: In this article, the rate constants for over 3500 reaction are tabulated, including reaction with molecules, ions and other radicals derived from inorganic and organic solutes, and the corresponding radical anions, ⋅O− and eaq−, have been critically pulse radiolysis, flash photolysis and other methods.
Journal Article
Critical review of rate condtants for reaction of hydrated electrons, hydrogen atoms and hydroxyl radicals in aqueous solution
Journal ArticleDOI
Yield for the scavenging of hydroxyl radicals in the radiolysis of nitrous oxide-saturated aqueous solutions
TL;DR: In this article, the thiocyanate dosimeter was calibrated against the Fricke system to obtain a value of 46,400 +-600 (molecules/100 eV) for the product of yield and extinction coefficient of (SCN)/sub 2/O-saturated solutions.
Journal ArticleDOI
Track effects in radiation chemistry. Concentration dependence for the scavenging of hydroxyl by ferrocyanide in nitrous oxide-saturated aqueous solutions
TL;DR: In this paper, the radiation chemical yield for oxidation of ferrocyanide by OH produced in the fast electron radiolysis of N/sub 2/O-saturated aqueous solutions was found to increase from a low concentration limiting yield of 5.2 to values in excess of 6.7.